US3925600A - Line switching system for digital data - Google Patents
Line switching system for digital data Download PDFInfo
- Publication number
- US3925600A US3925600A US542582*A US54258275A US3925600A US 3925600 A US3925600 A US 3925600A US 54258275 A US54258275 A US 54258275A US 3925600 A US3925600 A US 3925600A
- Authority
- US
- United States
- Prior art keywords
- digital data
- trunk
- data signals
- signaling system
- signals
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
Definitions
- Tr nk circuits disconnect Fleld of Search 179/18 AH, 18 E, 18 the trunk from the interconnection when the discon- '179/18 EB, 18 BH, 84 R, 84 SS, 84 T, 84 nect signals are passing through in both directions to 178/2 C preclude improper disconnect due to noise or interference on the trunk line.
Abstract
A switching office for line switching digital data messages that accepts inband digital address signals and forms selective interconnections to interchange data between data lines and data trunks. Termination of a call can be initiated by either end, digital data disconnect signals being sent from one end to the other and then back to the one end. Trunk circuits disconnect the trunk from the interconnection when the disconnect signals are passing through in both directions to preclude improper disconnect due to noise or interference on the trunk line.
Description
States Patent 1191 1111 3,925,600
UllitQ Cardwell et al. Dec. 9, 1975 LINE SWITCHING SYSTEM FOR DIGITAL 3,676,604 7/1972 Whitemyer 179/18 AH DATA 3,875,346 4/1975 ODea ct al. 179/18 E [75] Inventors: Robert Edward Cardwell, Fair Haven; Robert Leon Davis, Primary ExaminerThmas A. Robinson Holmdel? Pamck John Mann), Attorney, Agent, or Firm-Roy C. Lipton Middletown; Edward Joseph McNamara, Manalapan Township, Monmouth County, all of NJ.
[73] Assignee: Bell Telephone Laboratories Incorporated, Murray Hill, NJ. A switching office for line swltching d1g1tal data mes- [22] Flled: 1975 sages that accepts inband digital address signals and [211 App. No: 542,582 forms selective interconnections to interchange data between data lines and data trunks. Termination of a call can be initiated by either end, digital data discon- [57] ABSTRACT [52] US. Cl. 178/3; 179/18 AH t ignals being ent from one end to the other and [51] Int. Cl. H04L 11/00 h b k t th one end, Tr nk circuits disconnect Fleld of Search 179/18 AH, 18 E, 18 the trunk from the interconnection when the discon- '179/18 EB, 18 BH, 84 R, 84 SS, 84 T, 84 nect signals are passing through in both directions to 178/2 C preclude improper disconnect due to noise or interference on the trunk line.
[56] References Cited UNITED STATES PATENTS 14 Cl Drawing Figures 3,190,966 6/1965 James et al 179/18 Bl-I LINK AND 157 CONNECTOR CIRCUIT I06 H6 108 Raj "11 124-- tzo (m 102 LINE 123 125 TRUNK r' CIRCUIT if 1 P 1 TWOWAY I g l LOOPS i i 1 TRUNK 03 1 clddu li J CIRCUIT M 9.6kbs 9.6kbs 144 107 109 i I30 112 6| F 11ers- 128 CONNECTOR 01mm 55 REG] TER MARKER DECODER sENlmR CIRCUIT CIRCUIT CIRCUIT US. Patent Dec. 9, 1975 Sheet 15 of 28 3,925,600
i i m? wot BU 228 2 E22 585 8 50 So 8 5 6R US. Patent Dec. 9, 1975 Sheet 16 0f 28 3,925,600
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id So 9 6R .8. Patent Dec. 9, 1975 Sheet 19 of 28 3,925,600
Claims (14)
1. In a digital data signaling system, a switching office terminating two-way station lines and two-way trunk lines and having switch means for selectively interconnecting station lines and trunk lines to interchange digital data signals, CHARACTERIZED BY means connected to each of the trunk lines responsive to concurrence of predetermined incOming ones of the digital data signals on the trunk line and predetermined outgoing ones of the digital data signals on the selective interconnection thereof for releasing the trunk line from the selective interconnection.
2. In a digital data signaling system, in accordance with claim 1, wherein the releasing means includes means responsive to absence of digital data signals on the trunk line for providing the predetermined incoming digital data signal condition.
3. In a digital data signaling system, in accordance with claim 1, wherein the releasing means includes means responsive to absence of digital signals on the selective interconnection for providing the predetermined outgoing digital data signal condition.
4. In a digital data signaling system, in accordance with claim 3, and further including means connected to each trunk line responsive to the absence of outgoing digital data signals on the selective interconnection thereof for applying predetermined outgoing digital data signals to the trunk line.
5. In a digital data signaling system, in accordance with claim 1, wherein the releasing means is responsive to reception of a plurality of successive ones of the predetermined incoming digital data signals on the trunk line.
6. In a digital data signaling system, in accordance with claim 1, wherein the releasing means is responsive to reception of a plurality of successive ones of the predetermined outgoing digital data signals on the selective interconnection.
7. In a data signaling system, a plurality of switching offices interconnected by two-way trunk lines conveying digital data signals, each switching office including line circuits terminating two-way station lines conveying digital data signals, trunk circuits terminating the two-way trunk lines and switch means for selectively interconnecting station circuits and available ones of the trunk cirrcuits to interchange the digital data signals on the station and trunk lines, each of the trunk circuits being rendered unavailable when selectively interconnected, and each of the trunk circuits including means responsive to concurrence of predetermined incoming digital data signals on the trunk line and predetermined outgoing digital data signals on the selective interconnection for releasing the trunk circuit from the selective interconnection.
8. In a data signaling system, in accordance with claim 7 wherein the releasing means operates in response to a plurality of successive ones of the predetermined incoming digital data signals on the trunk line.
9. In a data signaling system, in accordance with claim 7, wherein the releasing means operates in response to a plurality of successive ones of the predetermined outgoing digital data signals on the selective interconnection.
10. In a data signaling system, in accordance with claim 7, wherein each of the line circuits includes means responsive to reception of diconnect signals from the station line for applying the predetermined outgoing digital data signals to the selective interconnection thereof.
11. In a data signaling system, in accordance with claim 7, wherein the trunk circuit includes means responsive to the predetermined incoming digital data signals on the trunk line for applying incoming disconnect signals to the selective interconnection and each of the line circuits includes means responsive to the application of incoming disconnect signals to the selective interconnection thereof for applying the predetermined outgoing digital data signals to the selective interconnection.
12. In a data signaling system, in accordance with claim 11, wherein the applying means operates in response to the application of a plurality of successive ones of the incoming disconnect signals to the selective interconnection.
13. In a data signaling system, in accordance with claim 12, wherein the releasing means operates in response to the application of a plurality of the predetermined outgoing digital data signals to the selective interconnection by the applying means.
14. In a data signaling system, in accordance with claim 7, wherein the releasing means includes means for rendering the trunk circuit available for a selective interconnection.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US542582*A US3925600A (en) | 1975-01-20 | 1975-01-20 | Line switching system for digital data |
| CA243,240A CA1057837A (en) | 1975-01-20 | 1976-01-09 | Line switching system for digital data |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US542582*A US3925600A (en) | 1975-01-20 | 1975-01-20 | Line switching system for digital data |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3925600A true US3925600A (en) | 1975-12-09 |
Family
ID=24164436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US542582*A Expired - Lifetime US3925600A (en) | 1975-01-20 | 1975-01-20 | Line switching system for digital data |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US3925600A (en) |
| CA (1) | CA1057837A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020012982A1 (en) * | 2000-07-13 | 2002-01-31 | Invitrogen Corporation | Methods and compositions for rapid protein and peptide extraction and isolation using a lysis matrix |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3190966A (en) * | 1962-11-30 | 1965-06-22 | Bell Telephone Labor Inc | Preferred customer communication system |
| US3676604A (en) * | 1970-08-12 | 1972-07-11 | Bell Telephone Labor Inc | Multiple trunk signal arrangement |
| US3875346A (en) * | 1974-02-25 | 1975-04-01 | Communic Mfg | Revertive pulsing |
-
1975
- 1975-01-20 US US542582*A patent/US3925600A/en not_active Expired - Lifetime
-
1976
- 1976-01-09 CA CA243,240A patent/CA1057837A/en not_active Expired
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3190966A (en) * | 1962-11-30 | 1965-06-22 | Bell Telephone Labor Inc | Preferred customer communication system |
| US3676604A (en) * | 1970-08-12 | 1972-07-11 | Bell Telephone Labor Inc | Multiple trunk signal arrangement |
| US3875346A (en) * | 1974-02-25 | 1975-04-01 | Communic Mfg | Revertive pulsing |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020012982A1 (en) * | 2000-07-13 | 2002-01-31 | Invitrogen Corporation | Methods and compositions for rapid protein and peptide extraction and isolation using a lysis matrix |
Also Published As
| Publication number | Publication date |
|---|---|
| CA1057837A (en) | 1979-07-03 |
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